A Tower Local Controller and Supervisor reported a small twin engine aircraft executed a go-around on short final and overflew an aircraft on a parallel runway and an aircraft in a holding area between 25 and 50 ft above the ground.
Synopsis
A Tower Local Controller and Supervisor reported a small twin engine aircraft executed a go-around on short final and overflew an aircraft on a parallel runway and an aircraft in a holding area between 25 and 50 ft above the ground.
Narrative
Aircraft X was conducting an ILS Runway XXC; on short final the aircraft dropped off of radar. Aircraft Y in the se hold pad near Runway XXL advised the Tower that an aircraft overflew the SE hold pad. Aircraft X conducted a go around without Tower knowledge and made a left hand turn towards the west side of ZZZ airport. The aircraft was so low they remained off of radar but was depicted on the ASD-E. Aircraft X's altitude (after reviewing falcon) was around 50 ft. ADS-B data reviewed later showed him about 25 ft. Local Control gained communication with the aircraft and gave them go around instructions. Aircraft X tried another approach to Runway XXL. The aircraft was questioned by Local Control if they were on the localizer. Aircraft X advised Tower they were going around. Local Control gave a 270 heading and 2000 ft. Aircraft X was not climbing and Local Control asked them verify they were climbing to 2000 ft. The aircraft eventually landed at an alternate airport with ZZZ Approach. ZZZ was notified of the issue with Aircraft X.A [report] was filed and was identified as a go around within a 1/2 mile final. After further review of the falcon and ADS-B data this should be elevated to a higher level to review the competency of the Pilot in Command for Aircraft X. ZZZ ATC followed the proper procedures during the event. ZZZ Operations Manager was notified of the event while it was taking place and advised us on how the classify the [report]. This event needs to be reviewed for potential safety issues that related to the go around with Aircraft X. There was significant potential for loss of life due to the pilots actions while flying in IMC conditions and conducting an approach with low weather criteria.
Second reporter narrative
I was working Local Control in the Tower. The weather was IFR and visibility was extremely poor. I was unable to see the runway or taxiways. Aircraft X was on an ILS approach to Runway XXC and cleared to land. I had an aircraft lined up and waiting on Runway XXL. Aircraft X dropped off the radar scope and appeared on the ASDE-X. This was brief and then Aircraft X's target dropped off the ASDE-X. A moment later and unknown aircraft keyed up and said 'Tower did you see that?' I did not see anything from my position due to visibility. I knew I had a missing aircraft that was no longer on the ASDE-X or on my radar scope. A target emerged south of the hold pad for Runway XXL and I slewed and clicked on it. I then asked Aircraft X if he was on the ground or in the air; as his position was unknown. He said he was in the air and his tag reappeared on the radar screen. I asked him what he was doing and the pilot replied 'I don't know.' I then asked Aircraft X if he had his navigation equipment still. He replied yes. I gave him a climb to 3;000 ft. and a heading of 330. The Controller working Clearance Delivery coordinated with the West Tower of Aircraft X. Once Aircraft X appeared to be climbing and flying the appropriate heading; I coordinated the go-around with TRACON sector and handed him off. It would be helpful to have an altitude read out on the ASDE-X. I was unsure if this aircraft was on the ground or in the air. Also proper communication from the pilot of his intentions. This was an incredibly dangerous situation that could have easily resulted in loss of life. I'm not sure why the aircraft turned left; instead of flying straight ahead. My only thought is that he had to of been lost in the poor visibility.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.